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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a22cc104054a3b41b6d08b9bf53d3680e537f1a3d7d756a79838c43a6e76f138' 
  AND token = 'tBCV1CNJIIukCfsM4v6RD0tz8dzhYhhbeNCcs6pjq1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}